LED Module Curvilinear Color Variation via Switched Current Paths
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Solution Overview
Problem
Existing LED modules can only vary emission color linearly within a narrow range near the blackbody radiation locus, leading to increased complexity in power supplies, control circuits, and control programs when trying to achieve arbitrary intensity with three LEDs of different colors during dimming operations.
Innovation Solution
An LED module with a circuit board, first and second light-emitting circuits, a switch element, and current detection elements, where the third LED group has a lower threshold voltage for emission, allowing the switch element to control current flow through different paths to achieve curvilinear color variation along the blackbody radiation locus without increasing the number of power supplies or control program complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If three LEDs of different colors are used to achieve arbitrary intensity with color mixing, then color adjustment flexibility is improved, but device complexity increases
Solution Approach 1:
The patent merges the control of multiple LED groups into a single control circuit that regulates total current. By combining multiple LED groups (first LED group with first color, second LED group with second color, third LED group with third color) under one control mechanism, the system achieves color mixing capability without requiring separate power supplies and control circuits for each LED group, thus reducing device complexity while maintaining color adjustment flexibility
Solution Approach 2:
The control circuit is designed with universal functionality to manage multiple LED groups simultaneously. The single control circuit can adjust the intensity of each LED group independently through current regulation, enabling the system to perform both color mixing and dimming operations with one control mechanism rather than requiring dedicated circuits for each function
2Ease of operation
If two LEDs with different color temperatures are used for dimming control, then ease of operation is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent selects LEDs with specifically designed chromaticity parameters where the third LED group has a lower threshold voltage for light emission compared to the second LED group. This parameter difference enables automatic current distribution based on voltage thresholds, simplifying the dimming control operation. The chromaticity points are strategically positioned to achieve curvilinear variation along the blackbody radiation locus, reducing the need for high-precision manufacturing tolerances
3Adaptability or versatility
If chromaticity points are positioned away from the blackbody radiation locus, then adaptability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent positions the chromaticity points to achieve curvilinear color variation along the blackbody radiation locus rather than linear variation. By selecting chromaticity points that follow a curved path (first color at lower color temperature on the locus, second color at higher color temperature positively deviated from the locus, third color with lower threshold voltage), the system expands the color variation range while the specific geometric arrangement reduces sensitivity to manufacturing precision requirements
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the LED module to vary emission color curvilinearly along the blackbody radiation locus during dimming without increasing the number of power supplies or control program complexity, allowing for more flexible and efficient color adjustment.
Implementation Method 1
a first LED group emitting light in a first color... a second LED group emitting light in a second color... a third LED group emitting light in a third color
Implementation Method 2
LEDs (light-emitting diodes) are used as a light source
Data Source
AI summary
An LED module includes, on a circuit board, first to fourth electrodes, a first circuit including a first LED group, and a second circuit including second and third LED groups, a switch element and a detection element. The second circuit includes a first path leading from the second LED group to one end of the detection element, and a second path leading from the third LED group via the switch element to one end of the detection element. The first and second electrodes are connected to the first circuit, the third electrode is connected to the second and third LED groups, and the fourth electrode is connected to the other end of the detection element. The threshold voltage for light emission of the second LED group is larger than that of the third LED group. The switch element controls a current flowing through the second path in accordance with a current flowing via the detection element.